Franz christoph b oem ann



HHIIHIIHW Patented Nov.. 30, 1897.

(No Model.)

UNITED STATES PATENT 'risica FRANZ CHRISTOPHBORMANN, OF HAMBURG,GERMANY.

STOVE OR OTHER FU RNACE.

SPECIFICATION forming part of Letters Patent No. 594,774, dated November30, 1897.

Application iiled August 1, 1896. Serial No. 601,360. (No model.)

To a/ZZ whom it may concern/.-

Be it known that I, FRANZ CHRISTOPH BOR- MANN, stove-manufacturer, ofNo. 19 Steintwiete, Hamburg, in the German Empire, have inventedImprovements in Stoves or other Furnaces, of which the following is aspecification, reference being had therein to the accompanying drawings.

The invention relates to stoves and other furnaces, and has for itsobject the complete combustion of all gases. For this purpose all thegases developed during combustion are passed again throu gh the furnace,while fresh air is added to 'them before their escape into the chimney,whereby complete combustion of all particles is obtained and a saving offuel is effected.

In order that my invention may be better understood, I now proceed todescribe the same, reference being had to the accompanying drawings, andto the letters and figures marked thereon.

Figure 1 shows a longitudinal section of a heating-stove. Fig. 2 showsalso a longitudinal section of the same, but at an angle of ninetydegrees to the former section. Fig. 3 shows a horizontal section throughthe same stove. Fig. l.t'shows a modified construction.

The fire-grate A is surrounded by the two annular shells B and C, whichhave alternating longitudinal ribs b c, which overlie one another andserve as conductors of heat. The channels formed by the shells B and Chave exits at their upper ends into the space H for the completely-spentgases of combustion. Above the iiregrate A and concentrically with theshells BA and C are formed two other annular channels D and E for thepartiallyburned gases and the completelyburned gases. The inner one ofthese two channels E reaches nearly to the top of the stove and has atits upper end admission-orifices y for the downward passage of thepartially-burned gases. The innermost shell forming the wall of thischannel extends to the fire. The second concentric shell, which formsthe channel D, extends to nearly the bottom of the furnace and has atits lower end cl orifices I 2 3 4 5 for the admission to the tire of thefresh air containing oxygen, which enters the stove through suitableair-admission pipes F. Below the air-admission orifices are providedexit-oriiices for the completely-burned gases, which end in the spacebetween the shells B and C.

The operation of such a stove isas follows: The gases containingunconsumed particles ascend upward in the innermost shell and enterthrough the orifices near the top into the innermost annular channel E,in which they descend. The gases then pass again through the heat of thefire, mixing with the fresh air containing oxygen, which is admittedfrom the outside atmosphere through the orices in d, and are thuscompletely burned. The heating-gases formed thereby pass through thesmoke-exit orifices provided below the air-admission orifices into theoutermost annular channel H, which is provided with the overlappinglongitudinal ribs. The latter, which become partly red-hot, burncompletely any unconsumed combustible particles which may still bepresent, and the gases escape now through the exit-channel I-I and theexit-flue I. The air-admission orifices x made below the annular channelformed by the shells B and C allow fresh air to enter also into thisspace to facilitate com plete combustion.

Another mode of construction of this furnace is illustrated by thevertical section shown in Fig. 4. In this construction the two innerconcentric channels D E do not extend to the top, but are considerablyshortened. The channel E extends above the fuel and the channel D onlyabove the burning fuel. A partition cl2 is provided in the channel D andhas orifices cl3. This partition is arranged direotly below theair-admission orifices F. The

other arrangements are the saine as previously described with referenceto Figs. l, 2, and 3.

What I claim, and desire to secu-re by Letters Patent of the UnitedStates, is-

The combination, with the grate, of an inner shell, a second shellforming with the rst the passage E leading to the fuel-space, com- ICOmunCat-ing at its upper end with the interior orifices for supplyingfresh air to said nal of the inner shell, and having near its lowercombustion-chamber. 1o end air-passages to the fuel-space, third and InWitness whereof I have' hereunto set my fourth shells C, B, having ribsc, b, forming hand in presence of two Witnesses.

5 afnal combustion-chamber, communicating FRANZ CHRISTOPH BORMANN.

at its lower end with the lower part of Ithe Vtne'sses: fuel-space,means for supplying fresh air to ERNST BAUMHOFF,

the space Without lhe second shell, and air- CARL AUGUST NIEKEL.

